How old is my Ameristar air conditioner?
Serial number age decoder for Ameristar central air conditioners: 5 format eras, the decode rule in plain English, transcribed tables, and the official lookup.
Type the serial from the data plate, not the model number. Nothing is sent anywhere; the tables are in this page.
Format example: 130313596L
- Ameristar air conditioner serial numbers in the 2010 to present format encode the year as digits 1-2 (YY, 2010+) and the week as digits 3-4 (source: building-center.org).
- Example: serial 130313596L decodes to week 3 of 2013.
- Ameristar air conditioner serial numbers in the 2010 to present format encode the year as digits 1-2 = YY (16323AP91G = 2016; 172310127M = 2017) and the fiscal week as digits 3-4; digit 5 = day of the fiscal week (source: building-center.org).
- Example: serial 16323AP91G decodes to week 32 of 2016.
- Ameristar air conditioner serial numbers in the 2002 to 2009 format encode the year as digit 1 = last digit of year (2002-2009) and the week as digits 2-3 (source: building-center.org).
- Example: serial 91531S41F decodes to week 15 of 2009.
- Ameristar's official lookup at ameristarhvac.com returns warranty / registration lookup.
Format eras
- 2010 to present VERIFIED
#########Adigits 1-2 (YY, 2010+) - 2010 to present VERIFIED
#####AA##Adigits 1-2 = YY (16323AP91G = 2016; 172310127M = 2017) - 2002 to 2009 VERIFIED
#####A##Adigit 1 = last digit of year (2002-2009) - 1983 to 2001 VERIFIED
A########letter 1 via table: W=1983 X=1984 Y=1985 S=1986 B=1987 C=1988 D=1989 E=1990 F=1991 G=1992 - 1970 to 1990 VERIFIED
A##A#####digits 2-3
How to read the serial
2010 to present formatVERIFIED
Shape #########A · example 130313596L · confidence high
- Year
- digits 1-2 (YY, 2010+)
- Week or month
- week = digits 3-4
- Plant
- remaining chars include plant/line and day-of-week; not published
Example: serial 130313596L decodes to week 3 of 2013.
Listed under Trane in the source; Ameristar is named in that format's family and the corporate link is an estimate, not a checked fact.
2010 to present formatVERIFIED
Shape #####AA##A · example 16323AP91G · confidence high
- Year
- digits 1-2 = YY (16323AP91G = 2016; 172310127M = 2017)
- Week or month
- fiscal week = digits 3-4; digit 5 = day of the fiscal week
- Plant
- trailing alphanumerics = build sequence (plant not published)
Example: serial 16323AP91G decodes to week 32 of 2016.
2002 to 2009 formatVERIFIED
Shape #####A##A · example 91531S41F · confidence high
- Year
- digit 1 = last digit of year (2002-2009)
- Week or month
- week = digits 2-3
- Plant
- letter(s) later in string
Example: serial 91531S41F decodes to week 15 of 2009.
Listed under Trane in the source; Ameristar is named in that format's family and the corporate link is an estimate, not a checked fact.
1983 to 2001 formatVERIFIED
Shape A######## · example F23456789 · confidence high
- Year
- letter 1 via table: W=1983 X=1984 Y=1985 S=1986 B=1987 C=1988 D=1989 E=1990 F=1991 G=1992 H=1993 J=1994 K=1995 L=1996 M=1997 N=1998 P=1999 R=2000 Z=2001
- Week or month
- week = digits 2-3
| Year code | Year(s) |
|---|---|
| W | 1983 |
| X | 1984 |
| Y | 1985 |
| S | 1986 |
| B | 1987 |
| C | 1988 |
| D | 1989 |
| E | 1990 |
| F | 1991 |
| G | 1992 |
| H | 1993 |
| J | 1994 |
| K | 1995 |
| L | 1996 |
| M | 1997 |
| N | 1998 |
| P | 1999 |
| R | 2000 |
| Z | 2001 |
Example: serial F23456789 decodes to week 23 of 1991.
Listed under Trane in the source; Ameristar is named in that format's family and the corporate link is an estimate, not a checked fact.
1970 to 1990 formatVERIFIED
Shape A##A##### · example A92M07217 · confidence medium
- Year
- digits 2-3
- Week or month
- position 4 = month (1-12)
- Plant
- letter 1 = factory code
Listed under Trane in the source; Ameristar is named in that format's family and the corporate link is an estimate, not a checked fact.
Where the data plate is on an air conditioner
On the outdoor condenser: a metal or foil plate on the side or back of the cabinet, often near the refrigerant line connections. Some brands repeat it inside the electrical access panel.
General guidance, not brand-specific: the owner's manual or the installer can point to the exact spot. See the data plate guide.
For scale only: the InterNACHI Standard Estimated Life Expectancy Chart for Homes lists Air Conditioner (central) at 7 to 15 years of expected service (nachi.org). That chart is a guideline, not a prediction for your unit.
Open the official Ameristar lookup takes serial number; returns warranty / registration lookup; URL verified live
This site is a reference built from published tables. The manufacturer's own lookup wins whenever the two disagree.
What we could not confirm
- Ameristar is treated as sharing Trane's format because the source lists it in that family; the corporate relationship itself is an estimate.
- The 1970 to 1990 format is documented but not decodable here: example A92M07217 does not decode with the derived engine.
- 'Ameristar is a TRANE International Inc. trademark' (building-center chart) and listed on tranetechnologies.com brands page; site footer is American Standard Heating and Air Conditioning. Styles 16323AP91G / 172310127M (2010+) and 91531S41F (2000-2009) = Trane rules. ameristarac.com is HTTP-only now (301 target ameristarhvac.com).
Sources
- https://www.building-center.org/trane/
- https://www.building-center.org/ameristar-hvac-age/
- https://www.building-center.org/wp-content/uploads/2017/11/Ameristar1-HVAC-Age.png
- https://www.building-center.org/wp-content/uploads/2018/06/Ameristar-Age-Style-2.png
- img: Trane-Style-2-Chart-2022.jpg (transcribed)
- https://www.ameristarhvac.com/warranty/official
